TY - GEN
T1 - Accurate quantum chemical calculation of the interaction of dihydrogen with hydrogen-storage materials
AU - Klopper, Wim
AU - Mavrandonakis, Andreas
PY - 2009/12/1
Y1 - 2009/12/1
N2 - Hydrogen may interact with hydrogen-storage materials (HSM) by means of chemi- or physisorption. In the case of chemisorption, molecular hydrogen (dihydrogen) is dissociated and adsorbed as atomic hydrogen with relatively large binding energies. Physisorbed hydrogen is characterized by very weak interactions between intact dihydrogen and the HSM. This talk focuses on physisorption, that is, on the quantum chemical calculation of the van der Waals interactions between dihydrogen and various other molecules or materials. The accurate and reliable calculation of such weak interactions poses a challenge for modern quantum chemistry for several reasons: (1) Dispersion forces are not captured by density-functional theory; (2) Electron-correlation methods suffer from high scaling of computational effort as well as from very slow basis-set convergence; (3) Supramolecular calculations of small interaction energies are easily corrupted by basis-set superposition errors. This talk will address these issues and present examples of how accurate and reliable quantum chemical calculations can be conducted in spite of the difficulties.
AB - Hydrogen may interact with hydrogen-storage materials (HSM) by means of chemi- or physisorption. In the case of chemisorption, molecular hydrogen (dihydrogen) is dissociated and adsorbed as atomic hydrogen with relatively large binding energies. Physisorbed hydrogen is characterized by very weak interactions between intact dihydrogen and the HSM. This talk focuses on physisorption, that is, on the quantum chemical calculation of the van der Waals interactions between dihydrogen and various other molecules or materials. The accurate and reliable calculation of such weak interactions poses a challenge for modern quantum chemistry for several reasons: (1) Dispersion forces are not captured by density-functional theory; (2) Electron-correlation methods suffer from high scaling of computational effort as well as from very slow basis-set convergence; (3) Supramolecular calculations of small interaction energies are easily corrupted by basis-set superposition errors. This talk will address these issues and present examples of how accurate and reliable quantum chemical calculations can be conducted in spite of the difficulties.
UR - http://www.scopus.com/inward/record.url?scp=78649515798&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78649515798&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:78649515798
SN - 9780841224414
T3 - ACS National Meeting Book of Abstracts
BT - American Chemical Society - 237th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
T2 - 237th National Meeting and Exposition of the American Chemical Society, ACS 2009
Y2 - 22 March 2009 through 26 March 2009
ER -